Interactions of Subjective and Objective Measures of Fatigue Defined in the Context of Brain Control of Locomotion
Interactions of Subjective and Objective Measures of Fatigue Defined in the Context of Brain Control of Locomotion
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DOI：
10.1093/gerona/glw167
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发表时间：
2017-03-01
影响因子：
5.1
通讯作者：
Wang, Cuiling
中科院分区：
文献类型：
--
作者：
Holtzer, Roee;Yuan, Jennifer;Wang, Cuiling
背景：疲劳对老年人的生活质量有不利影响。然而，人们对疲劳的主观和客观测量之间的关系知之甚少。我们研究了主观疲劳是否调节运动过程中客观疲劳的表达。预测疲劳的客观和主观措施之间的关联，以体现只有在双重任务的条件下，最大限度地提高认知demands.Methods：参与者是314非痴呆老年人（年龄= 76.8 +/- 6.7岁; %女性= 56）。功能性近红外光谱被用来评估步行过程中的氧合血红蛋白（HbO（2））水平。使用4 x 14英尺Zeno电子走道评估步幅速度（cm/s）。客观疲劳可操作为在单任务（正常行走）和双任务（边走边说）条件下连续6次直线行走期间HbO（2）水平的衰减和步幅速度（cm/s）的下降。结果：从正常行走到边走边说，主观疲劳程度越严重，HbO（2）水平的增加越少（估计值= 0.175; p 0.05）。在正常行走过程中，客观疲劳没有表现出来，也与主观疲劳无关。在第四组中，主观疲劳程度越严重，HbO（2）水平越低（估计值= -0.178; p
Background: Fatigue adversely impacts quality of life in old age. The relationship between subjective and objective measurements of fatigue, however, is poorly understood. We examined whether subjective fatigue moderated the expression of objective fatigue during locomotion. Associations between objective and subjective measures of fatigue were predicted to manifest only under dual-task conditions that maximized cognitive demands.Methods: Participants were 314 nondemented older adults (age = 76.8 +/- 6.7 years; % female = 56). Functional near-infrared spectroscopy was used to assess oxygenated hemoglobin (HbO(2)) levels during walking. A 4 x 14-foot Zeno electronic walkway was utilized to assess stride velocity (cm/s). Objective fatigue was operationalized as attenuation in HbO(2) levels and decline in stride velocity (cm/s) during six continuous straight walks under single-(normal-walk) and dual-task (walk-while-talk) conditions. The Brief Fatigue Inventory assessed subjective fatigue.Results: Worse subjective fatigue was associated with attenuated increase in HbO(2) levels (estimate = 0.175; p .05) from normal-walk to walk-while-talk conditions. Objective fatigue did not manifest and was not associated with subjective fatigue during the course of normal-walk. Worse subjective fatigue was associated with attenuated HbO(2) levels in the fourth (estimate = -0.178; p